Frank mcclure



No. 436,459. Patented Sept. 16, 1890.

fi ii 2 A i) F 2 I E H 2L 4 F -31 wwwwseo 8 gl'wuwntoz UNITED STATESPATENT OFFICE.

FRANK MCCLURE, OF STOCKTON, CALIFORNIA, ASSIGNOR OF ONE-HALF TO AMERICUSM. ABBOTT, OF SAME PLACE.

CHUCK FOR TURNING-LATHES.

SPECIFICATION forming part of Letters Patent No. 436,459, datedSeptember 16, 1890.

Application filed April 24, 1890- .l'o all whom it may concern:

Be it known that I, FRANK MCCLURE, a citizen of the United States,residing at Stockton, in the county of San Joaquin and State ofCalifornia, have invented certain new and useful Improvements in Chucksfor Turning- Lathes; and I do hereby declare the following to be afull,clear, and exact description of the inventiomsuch as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to an appendage to a lathe, and is of the classcalled chucks; and it consists in such devices and combination ofdevices as will permit of the portion of the crank-shaft to be turnedbeing placed in a direct line with the lathe-spindle, and being graspedin the jaws of the chuck simply and expeditiously.

In the drawings, Figure 1 is a side elevation of my improved chuck,showinga crankshaft attached and in position to be turned. Fig. 2 is aright-hand elevation of the same with the crank-shaft removed. Fig. 3 isa section through line X X, Fig. 2.

Similar letters of reference indicate corresponding parts in the severalviews.

A is the usual lathe-spindle.

B is the hub that is screwed onto the spindie A.

B is the main body of the chuck, and B are lugs, one on each side of thebody B and provided with slots.

A bridge C is secured to the lugs B? by bolts B at the slots of thelugs,which permit it to be moved back and forth and thus be adjusted todifferent sizes of crank-shafts. The top of the bridge C is providedwith jaws having threaded eyes for the reception of set screws 0 forgrasping the crank-shaft G at its elbow and near the portion G to beturned.

A slide C, provided with a slot e at each corner, is attached to thebody B by bolts D inserted through the slots 6 and carrying washers d,and has at its top a hub F for the reception of the end of thecrank-shaft G, which is held firmly in the hub F by set-screws F.

The slide 0 is moved back and forth, as is required, by anadjusting-screw D, provided $erial No. 849,246. (No model.)

with a head D for turning the same. The screw D is held in place by aguide-block E, provided with a threaded eye and secured to the body B bybolts E.

To gage my improved chuck for use I attach it at the hub B to thelathe-spindle and adjust the slide C and the adjustable bridge C, sothat the hub F will receive the end of the crank-shaft G, and the jawsof the bridge C will grasp the elbow of such shaft. The bolts D and Bare then screwed up tightly, and the set-screws F and C likewise, thusholding all the various parts firmly in position for turning the part Gof the crankshaft G. The slideC has alongitudinal oval ridge at itscenter, parallel with and fitting into channel in the face of the bodyB. The slide C is also slightly dovetailed into the body B, thusinsuring steady action. The ridge of the slide C also furnishes thefoundation for the attachment of the adjustingbolt D.

Having thus described my invention, what I claim as new is 1. In achuck, the combination, substantially as described, of the main body B,provided with the slotted lugs B the bridge C, attached to the body B atthe slots of the lugs B by the bolts B the slide C, provided with slots6 at each corner and secured to the body B by the bolts D, the body Bprovided with the hub B for the reception of the lathe-spindle, theslide C provided with the hub F for the reception of the end of thecrank-shaft, and the bridge C being provided with the jaws having theset-screws C for the reception of the elbow of the crank-shaft, and theslide C having the adjustable screw D secured to the end of the body Bby the guide-block E and its bolts E.

2. The combination of the body B, having the hub B and slotted lugs Bwith the adjustable bridge C, provided with jaws, and with the slide C,having the hub F, the slide C and bridge C being suitably secured to thebody B, and suitable means for adjust. ing the position of the slide Cand bridge C, all substantially as described.

i 3. As anew article of manufacture,achuck composed of the main body B,provided with suitable means of attaching to the lathe-spinthecrank-shaft at its elbow, all substantially zo dle, so that the part ofthe crank-shaft to be as described and set forth.

turned may be in a direct line therewith, the In testimony whereof Iaffix my signature in slide 0, adj ustably attached to the body Bpresence of two Witnesses.

and provided with the hub F and its setscrews for the reception of theend of the FRANK MOCLURE. crank-shaft, and the bridge 0, adjustablyWitnesses: attached to the body 13 and provided with E. BEECHER STOWE,

jaws having the set-screws C for grasping EDRIS B. MYERS.

